When to plant Broccoli in Zone 3a
In Zone 3a, Broccoli: start seeds indoors around Apr 6–Apr 20; transplant outdoors around May 11–May 25; direct sow outdoors around Jun 2–Jun 23. Expect to harvest around Jul 15–Jul 29.
| Step | When |
|---|---|
| Start seeds indoors | Apr 6 – Apr 20 |
| Transplant outdoors | May 11 – May 25 |
| Direct sow outdoors | Jun 2 – Jun 23 |
| Harvest | Jul 15 – Jul 29 |
| Harvest | Aug 6 – Aug 27 |
Tip: A cool-season brassica. Transplant in early spring or late summer; it bolts in midsummer heat.
Zone 3a averages a last spring frost around May 25 and a first fall frost around Sep 8. These are zone averages — look up your ZIP for your exact area.
See the full Zone 3a calendar in the tool →